Removed old files

1 files changed, 0 insertions, 274 deletions

diff --git a/old/2021-11-10-beforeremovingchecker/utils.c b/old/2021-11-10-beforeremovingchecker/utils.c
deleted file mode 100644
index f72a00e..0000000
--- a/old/2021-11-10-beforeremovingchecker/utils.c
+++ /dev/null
@@ -1,274 +0,0 @@
-#include "utils.h"
-
-void
-apply_permutation(int *perm, int *set, int n)
-{
-        int *aux = malloc(n * sizeof(int));
-        int i;
-
-        if (!is_perm(perm, n))
-                return;
-                
-        for (i = 0; i < n; i++)
-                aux[i] = set[perm[i]];
-
-        memcpy(set, aux, n * sizeof(int));
-        free(aux);
-}
-
-int
-binomial(int n, int k)
-{
-        if (n < 0 || k < 0 || k > n)
-                return 0;
-
-        return factorial(n) / (factorial(k) * factorial(n-k));
-}
-
-int
-digit_array_to_int(int *a, int n, int b)
-{
-        int i, ret = 0, p = 1;
-
-        for (i = 0; i < n; i++, p *= b)
-                ret += a[i] * p;
-
-        return ret;
-}
-
-int
-factorial(int n)
-{
-        int i, ret = 1;
-
-        if (n < 0)
-                return 0;
-
-        for (i = 1; i <= n; i++)
-                ret *= i;
-
-        return ret;
-}
-
-void
-index_to_perm(int p, int n, int *r)
-{
-        int *a = malloc(n * sizeof(int));
-        int i, j, c;
-
-        for (i = 0; i < n; i++)
-                a[i] = 0;
-
-        if (p < 0 || p >= factorial(n))
-                for (i = 0; i < n; i++)
-                        r[i] = -1;
-
-        for (i = 0; i < n; i++) {
-                c = 0;
-                j = 0;
-                while (c <= p / factorial(n-i-1))
-                        c += a[j++] ? 0 : 1;
-                r[i] = j-1;
-                a[j-1] = 1;
-                p %= factorial(n-i-1);
-        }
-
-        free(a);
-}
-
-void
-index_to_subset(int s, int n, int k, int *r)
-{
-        int i, j, v;
-
-        if (s < 0 || s >= binomial(n, k)) {
-                for (i = 0; i < n; i++)
-                        r[i] = -1;
-                return;
-        }
-
-        for (i = 0; i < n; i++) {
-                if (k == n-i) {
-                        for (j = i; j < n; j++)
-                                r[j] = 1;
-                        return;
-                }
-
-                if (k == 0) {
-                        for (j = i; j < n; j++)
-                                r[j] = 0;
-                        return;
-                }
-
-                v = binomial(n-i-1, k);
-                if (s >= v) {
-                        r[i] = 1;
-                        k--;
-                        s -= v;
-                } else {
-                        r[i] = 0;
-                }
-        }
-}
-
-void
-int_to_digit_array(int a, int b, int n, int *r)
-{
-        int i;
-
-        if (b <= 1)
-                for (i = 0; i < n; i++)
-                        r[i] = 0;
-        else
-                for (i = 0; i < n; i++, a /= b)
-                        r[i] = a % b;
-}
-
-void
-int_to_sum_zero_array(int x, int b, int n, int *a)
-{
-        int i, s = 0;
-
-        if (b <= 1) {
-                for (i = 0; i < n; i++)
-                    a[i] = 0;
-        } else {
-                int_to_digit_array(x, b, n-1, a);
-                for (i = 0; i < n - 1; i++)
-                    s = (s + a[i]) % b;
-                a[n-1] = (b - s) % b;
-        }
-}
-
-int
-invert_digits(int a, int b, int n)
-{
-        int i, ret, *r = malloc(n * sizeof(int));
-
-        int_to_digit_array(a, b, n, r);
-        for (i = 0; i < n; i++)
-                r[i] = (b-r[i]) % b;
-
-        ret = digit_array_to_int(r, n, b);
-        free(r);
-        return ret;
-}
-
-bool
-is_perm(int *a, int n)
-{
-        int *aux = malloc(n * sizeof(int));
-        int i;
-        
-        for (i = 0; i < n; i++)
-                if (a[i] < 0 || a[i] >= n)
-                        return false;
-                else
-                        aux[a[i]] = 1;
-
-        for (i = 0; i < n; i++)
-                if (!aux[i])
-                        return false;
-
-        free(aux);
-
-        return true;
-}
-
-bool
-is_subset(int *a, int n, int k)
-{
-        int i, sum = 0;
-
-        for (i = 0; i < n; i++)
-                sum += a[i] ? 1 : 0;
-
-        return sum == k;
-}
-
-int
-perm_sign(int *a, int n)
-{
-        int i, j, ret = 0;
-
-        if (!is_perm(a,n))
-                return -1;
-
-        for (i = 0; i < n; i++)
-                for (j = i+1; j < n; j++)
-                        ret += (a[i] > a[j]) ? 1 : 0;
-
-        return ret % 2;
-}
-
-int
-perm_to_index(int *a, int n)
-{
-        int i, j, c, ret = 0;
-
-        if (!is_perm(a, n))
-                return -1;
-
-        for (i = 0; i < n; i++) {
-                c = 0;
-                for (j = i+1; j < n; j++)
-                        c += (a[i] > a[j]) ? 1 : 0;
-                ret += factorial(n-i-1) * c;
-        }
-
-        return ret;
-}
-
-int
-powint(int a, int b)
-{
-        if (b < 0)
-                return 0;
-        if (b == 0)
-                return 1;
-
-        if (b % 2)
-                return a * powint(a, b-1);
-        else
-                return powint(a*a, b/2);
-}
-
-int 
-subset_to_index(int *a, int n, int k)
-{
-        int i, ret = 0;
-
-        if (!is_subset(a, n, k))
-                return binomial(n, k);
-
-        for (i = 0; i < n; i++) {
-                if (k == n-i)
-                        return ret;
-                if (a[i]) {
-                        ret += binomial(n-i-1, k);
-                        k--;
-                }
-        }
-
-        return ret;
-}
-
-void
-sum_arrays_mod(int *src, int *dst, int n, int m)
-{
-        int i;
-
-        for (i = 0; i < n; i++)
-                dst[i] = (m <= 0) ? 0 : (src[i] + dst[i]) % m;
-}
-
-void
-swap(int *a, int *b)
-{
-        int aux;
-
-        aux = *a;
-        *a = *b;
-        *b = aux;
-}
-